As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM - APU AUTO SHUTDOWN AT GATE. PER FIM 49-11-00-1 FIG 103 BITE ON ECU FAULTS REV FLOW. RESET ECU RE-STARTED APU NO FURTHER FAULTS NOTED. OK TO CONTINUE. NOTE APU AIR ON DMI AND GROUND AIR CART WAS SUPPLYING AIR AT THE TIME OF SHUTDOWN.